John t



(No Model.) I

J.- ,T. HAWKINS.

MEANS FOR SECURING PRINTING PLATES T0 OYLINDRIGAL SURFACES.

No. 604,149. 4 Patented May 17,1898.

I ;:LLIEFI[DLC 3 W4,

' Htmrq q- .ATENT EFIcE.

JOHN T. HAWKINS, or TAUNToN, MASSACHUSETTS, ASSIGNOR TO TIIE CAMPBELLPRINTING PREss AND MANUFACTURING COMPANY, on

NEW YORK, N. Y.

MEANS FOR SECURINQPRINTING-PLATES T0 CYLINDRICAL SURFACES.

SPECIFICATION forming part ofLetters Patent No. 604,149, dated May 17,1898.

Application filed December 7, 1888. Serial No. 292,884. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN T. HAWKINS, of Taunton, in the county ofBristol and State of Massachusetts, have invented a new and useful Meansfor Securing Curved Printing Plates or Blocks to Cylindrical Surfaces,which invention is fully set forth and illustrated in the followingspecification and accompanying drawings.

The object of this invention is to secure curved printingplates orblocks to the formcylinders or cylindrical form surfaces ofprinting-machines,so that they maybe placed with their edges in closecontact with each other, thus making up a continuous printingsurfacewhere desired or held in any other desired relative position on andsecurely held as so placed.

The invention consists in the means for securing such printing plates orblocks to thin strips of metal either by rivets, screws, or othersuitable fastenings, said strips being then strained into close contactwith a cylindrical form-surface by any suitable straining deviceapplying tensional strain at their ends-as, for instance, by the deviceshown in Letters Patent granted to me June 9, 1891, No. 453,862.

In the accompanying drawings, Figure 1 is sectional broken view of acylindrically-surfaced turtle, bed, or plate-holder, showing thestraining device above mentioned, which is fully described in theaforesaid patent, with the plates and holding-strips attached. Fig. 2 isan edge view of a holding-strip, showing the rivets secured in it uponwhich to cast the printing plates or blocks, the blocks being shown indotted lines. Fig. 3 is an edge view of a similar strip with punched-upprojections formed in it answering the place of the rivets. Fig. 4 is aview in plan of Fig. 3. Fig. 5 is a partial transverse section through acylindrical turtle or bed, showing the holding strips laid incircumferential grooves formed therein for their reception. I

In said figures the number 1 indicates the turtle or plate-holder withits straining apparatus above mentioned, 2 the plates, and 3 the tyingor holding strips.

In the left-hand part of Fig. 1 the blocks 2 are shown as attached tothe strips by countersunk-head screws 4, leaving the under side of thestrips flush and smooth, so that the strip, with its attached plates orblocks, may be placed in any desired position upon the cylindricalsurface. In the'right-hand part of Fig. 1 the turtle or bed is showngrooved for the reception of the head of a button-head screw 5, whichmay be the most desirable way of securing the plates to the strips 3 forsome variety of forms or plates.

The holding-strips 3, as shown in Fig. 2, have rivets 6 permanentlyfixed in them, the

strips and rivets attached being placed in the mold when the plate orblock is cast and the plates or blocks cast over the projectingrivetheads, as shown in dotted lines. In Figs. 3 and 4 the punched-upprojections 7 serve the same purpose as the rivets 6.

When desirable, the cylindrical surface upon which the plates are to beheld may be circumferentially grooved, as shown in Fig. 5, allowing theholding-strips 3 to lie wholly below the cylindrical surface, in whichcase the holding-strips 3 may be slotted crosswise for small transverseadjustment of the plates 2 upon the strips 3.

While my invention has been especially designed for securing curvedprinting-plates to cylindrical surfaces, it is of course obvious that mymeans may be used to secure plates to plane surfaces.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

1. In combination with a printing form or bed having acircumferentially-grooved cylindrical surface, thin tying or holdingstrips, as 3, provided with means for securing the under sides ofprinting blocks or plates thereto, and adapted to be strained upon saidcylindrical surface, substantially as and for the purposes set forth.

2. The combination of a cylindrical holding-surface, grooves formedtherein, straining-strips fitting within said grooves, said cylindricalsurface carrying straining means for said strips, said strips carrying anumber of printing-plates, substantially as described.

JOHN T. HAWKINS.

Witnesses:

ALBERT J. PARK, 7 FRED. A. MERIGOLD.

